Alarm dispatching mechanism



Nov. 14, 1939. J. F. EBERT ET AL' ALARM DISPATCHING MECHANISM Original Filed Aug. 23, 1934 ,fa'deplz F ['berf TllefA'. e "@5672: ar C Jar-78 Patented Nov. 14, 1939 UNITED STATES PATENT ()F'FlC'E,

"Joseph-F. Ebert,Hollis, N. Y., andTellef AuTerjesen, Hoboken, No.1, assignorsto Signal Engineering & Manufacturing Company, New York, N. Y., a corporation of Massachusetts 'Original application August'2 3, 1934, Serial No. 741,140, now Patent No. 2,077,099, dated April 13, 1937. Divided and thisapplication May 12,

1936, Serial No. 79,332

' 1 Claim.

The present application is a division of our original application, Serial No. 741,140, filed August 23, 1934, now Patent No. 2,077,099 of April 13,

1937 for a Fire alarm dispatching mechanism, and relates particularly to a dispatching mechanism, by the operation of which a given code is sent, in accordance with the arrangement of code determining projections on a rotatable element, usually known as a code wheel.

According to .the invention of the present application, there is provided an improved mounting for code determining elements, which permits an element to be readily removed and another element substituted therefor, in order to change the code designation of a particular sending station, without in any way disturbing any other part of the dispatching mechanism. The improved construction also insures that the substituted code determiningelement will occupy the same angular position on its operating shaft as did the element which has been removed. The above and other advantageous features of the invention will hereinafter more fully appear from the following description .taken in connection with the accompanying drawing, in which:

Fig. l is a view in side elevation, of a dispatching mechanism embodying the invention.

Fig. 2 is a view in end elevation of the parts shown in Fig. 1, as viewed from the left.

which constitutes the subject matter of the present invention.

The code wheel I I provides around its periphery a number of code determining projections I Ia, and rotation of the wheel I I causes these projections lid to operate a pivotally mounted arm I2. The arm I2 provides a projection I3, of insulating material, which is disposed between a pair of contact members I4 and I5. Normally, contact tips I la and I5a on these contact members I4 and I5 are in engagement as shown, but when a code projection II a engages the arm I2, turning of the latter in a clockwise direction about its pivot IZa causes the arm projection I3 to disengage the contact tip I4a from the contact tip I5a. As the projections IIa on the code wheel II successively engage the arm I2, an oscillatory movement is imparted to the arm I2 which results in successive disengagement and reengagemerit-cf the contact members I4 and I5. This operation of the contacts causes signal impulses to be transmitted through the signal system, in which the mechanism is connected, which system forms no part of the present invention.

As previously pointed out, the present invention contemplates an improved mounting of the code wheel I I, whereby the latter may readily be removed from the shaft I0, and this mounting is best shown in Figs. 3 and 4. To this end, the

Wheel II carries a bracket I6 having an opening Fig. 3 is a fragmentary view, illustrating the mounting of the code determining element. g f p f g i i fi g g g g g Fig. 4 shows the element of Fig. 3 removed proJec mg en 2 e S a e F e also provides a slot I8 for receiving a pin I9 exfrom its operating shaft.

. tending transversely through the shaft I0. Like reference characters refer to like parts 1n Therefore when the Shaft m is passed through W the dlfieyent the opening H in the bracket I6 with the pin 00 R-eferimg first to Flgs' 1.and the dlspatchmg I9 received in the slot I8, the code wheel II is mechamsm shown as Ewing beien f m from adapted to rotate with the shaft I0. After a code the alarm or Statlon m whlch 1t 15 normally wheel II has been so positioned on the shaft, it 40 muunted' 15 adapted to be actuajted by hand is secured against removal-therefrom by turning t lever I accessible from the outside of the box. Set screws 20 to draw together portions f the lever l 15 mounted f aishaft and bracket on opposite sides of the slot I8, thereby mg of the lever in the direction of the arrow in causing the k t t hold the pin I9 tightly. 1 toothed sector 3 P Shaft 2 to These screws 29 are readily accessible from the tu a pmwn 4 mounted on a shafv The shaft left-hand side of the device, as viewed in Fig. 1, 45

5 als is co t to a spring shown in d in which the screws are shown in dotted lines. lines, Within a casing carried by the frame When it is desired to remove the code wheel II plate I, and this spring is wound by turning of and replace it with another wheel having a difthe lever I Con q l p n release f the ferent code determination, it is only necessary to lever l at the e d o its Operating ent, the loosen the screws 20 and withdraw the wheel 50 tension of the wound spring 6 on the shaft 5 acfrom the shaft E0. Then when a wheel II havtuates the dispatching mechanism. The shaft 5 ing a different code determination is placed on also carries a gear 8 in mesh with a pinion 9 on the shaft with the screws 20 facing, as shown in a shaft III on which is also mounted a code deter- Figs. 1 and 2, the pin I9 engaging with the slot I8 mining element or wheel II, the construction of of the new wheel insures that the new wheel will 55 occupy exactly the same angular position on the shaft [0 as did the wheel just removed. This insures that when code Wheels are changed on the dispatching mechanism, there is no possibility of the code being mis-sent by the new wheel, 0wing to it being positioned on the shaft III in the wrong angular relation with respect to the contact operating arm l2.

From the foregoing, it is apparent that by the present invention there is provided an improved alarm dispatching mechanism characterized by the fact that the code determining element of the mechanism can be quickly removed and a different element substituted therefor, without any possibility of such substitution causing any disturbance in the timing of the mechanism, when operated.

shaft.

JOSEPH F. EBERT. TELLEF A. TERJESEN. 

